Nut-tap.



o. A. SMJTH.

NUT TAR.

APPLICATION FILED JALzl.- 1911.

Patented July 30, 1912.

LSS.

- deflected .portions terminating in alined FACTURING COMPANY, OF CLEVELAND, 07H10,

CORPORATION F OHIO.

NUT-TAP.

4 Specification of Letters Patent. Application led y.1m-mary 21, 1911. Serial No. 603,811. v

Patented July 30,1912.

To all whomz't mag/concern.' f

vBe it knownlthat I, OSCAR A. SMITH, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have inventedicertain new` and useful' improvements inlut-Taps,l of

which the 'following is a. specification.

f and :before delivery from the discharge end v,of the tap, 'and which is so constructed that",

, strength' d .and ini'vv tl`1e'r`i`rgi-` ion of the nuts'passing along the tap "isvfiff materially decreased While the vlthe tap is materially increased,. h oh thev cost of manufacture as well as the time necessary to set thetap are also decreased. l

I am' aware that taps having curved or 1 straight.y portionshave been patented, and

thefpresent construction of tap is an improyementover this style ot tap.- In taps having deflectedl portions there are three essential things to be taken into considera# vtionFirst the friction or rub on the in-l .terior ofthe ,nut after passing over the threadedhead 'or portion of the tap, and also the rub or :friction on the .exterior of the-holder. Second, the curve or bend of the tap, rit'or thalar er the curve the stronger will be thetap. d third, rthelength of 'the tap, a short tap not only result-mg in a saving in material,.but also in the .time and labor in manufacturing the same, as

A well as the time in setting the tap in the machine. in tapsof the style having both ends inl alinement With -a center deiiecte'd to form a compound curve each nut as it passes over the-threaded portion of the tap comes l into contact with the first nut on the .shank or plain portion of the tap, making it neces-v l Asary to'force back all of the nuts ahead 'ofit on the shank yto;make room for itself, thereby causing considerable friction, this friction being greatest at the points Wherethe tap curves into the straight Vportions thereof and at a pointintermediate these points, and this friction must be overcome bythe last thread ofthe nut passing over the threaded portion of the tap, thus increasing the liabilityof spoilin vthe last .fthreadof the nut blank because o increased :friction Aand strain.' vflint by Vproviding 'a .ftap Witha'darge circular curve and termi* f {nating in one `straight portion only, and that carrying the threads, the friction of the nut passing over the shank is very little more than if the shank were straight, in view of the fact' that the curve is so large that Sev' eral nuts receive the strain", so that the dan# ger of cooking or tipping is greatly eliminat-ed', it being possible to iit nuts much closer in a holder using the Ipresent improved tap, since there isno liability of thel nuts sticking at turns or curves as in the' case of taps made u of ,several deflected portions, or of taps Ihaving deflected portions terminating in straight portions at its ends, such sticking of the nuts being greater it the nut blanks are long, which Would necessitate a much longer llength of t-apin proportion, Whereas in the presentA .improved form 'of tap all of these disadvantages are eliminated, since there are no sharp angles and the nut blank is free' to travel Without danger of cramping, thus -avoidin the spoiling of the last thread of a nutgblank that is about to pass from the threaded portion of the tap. Furthermore, the large circular curveof the present form of tap, Without4 any 'straight portion at its disfJ charge end, gives ,a powerfuldriving force and distributes the driving strain all along the tap, thus making the prescrit improved' form of tap much stronger than those heretofore provided. In other Words, by forming the tap with asingle straight portion -curvature the nut blanks are readily forced along the tap shank With very little additional friction over a straight shank tap, While the advantage of utilizing thenuts as the driving means in a curved form of tap i's still obtained.

In the drawings accompanying and forming part of this specification, Figure l illustrates a part of a machine in Which this improved tap may be operated; Fig. 2

illustratesa holderl for the tap, the same being shown partly in section with the tap and the nut blanks located' therein; Fig. 3 is a frontvievv of the holder; and Fig. 4 is a View of the tap.

Similar characters of reference ,indicate corresponding'parts'throughout the iigures of the drawmgs.

ln' the present improvement. the tap 2 closing the tap and having at its inclosing part the same formation as the tap, this holder being of larger diamter than the tap so asto provide proper room for the passage of the nuts along the shank of the tap, and of greater length, as at 13, to properly guide the nuts. By rotating the holder the tap is rotated through the medium of the nuts intermediate suoli .tap and the holder in a manner Which will be readily Cil understood, and for the purposeJ of rotating this holder some suitable means will be provided. In the present instance this holder is shown supported in a slottedspindle or sleeve 10 vertically supported and driven by some suitable driving means, the nut blanks being fed to the tap by means of a turn table 11.

The mechanism for supporting and rotating the holder, and in the present case for imparting reciprocatory or lengthwise movement to the tap, and for feeding the nut blanks to the tap will constitute the subject-matter of a separate application,

and itis therefore not claimed herein.

From the foregoing it will he observed that the tap has but one deflected or curved portion forming the crank for rotating it, and but one straight portion terminating in the threaded end ofthe tap, and that this curved or deflected portion has a large circular curve terminating at the discharge end of the tap, so that there is no opportunity by reason of successive deflected portions or successive curved portions at either end of the tap for materially increasing the friction of the nut blanks and cramping the same during their passage along the tap, 'and consequently the nut blanks will readily pass along the tap and be discharged therefrom quickly, without cramping-of the nut blanks or materially lincreasing the friction thereotl on the tap, so that the mutilation or spoiling ot the last thread of each blank as it passes from the threaded end of the tap is avoided, While at the same time the tap may be made very much shorter and its strength materially increased and' the driving strain equally distributed all along the tap. 1t Will also' hel observed that the threaded end of the tap and the curved end' thereof are out of alinement, so that, as

stated, there are no sharp angles around ing into and terminating in a curved dis-A charge end extending 1n the same general.

direction as said threaded end.

2. A nut tap having a single straight threaded end merging into and terminating in a single large cireu-larly curved portion extending in the same general direction as said threaded end.

3. A. nut tap having a threaded end and a discharge end extending in the same general direction as` the threaded end but out' ot' alinement therewith, said ends connected by a single curved portion.

4. A nut tap having a straight threaded end merging into and terminating in a curved discharge end extending in the same general direction as the straight threaded end but ou-t of alinement therewith.

5. A nut tap'having a threaded end merging' into a compound curve-shank, the discharge end of the tap terminating With the curved end of the shank.

6. A nutv tap extending in the same' general direction and having opposite end poru tions out of the same axial line and an intermediate deflected curved portion merging into said end portions.

7. A nut tap extending in the same general direction and having opposite end portions out of the same axial line and an interminate curved deflected 4portion merging into said end portions.

Signed at Cleveland Ohio this 18th dayA of January, 1911.

' OSCAR A. SMTH.

I Witnesses:

A. E. HENN, W. E. Non'rrroornthat shown I Correction in. Letters Patent'Ne; 1,033,836..

It ig--hereby-certifled thatv i Letteis IPat-ent No. 1,033,83@ lgrented. July.A 30, v 1912, upon the application cf Ov-sca;` of lefelaixd, Chic, fer en inllprovef .ment in Nui-Taps, an error 'appears in the printedlspecilication requirixig correc- Acionl as follows: Page. 2', linesV 1055106, for the Wordinterminate read z'ntemzedz'-l ate; and that the saidA Let-ters Patent -should be read with this correction therein that the same may conform tio therecrd of the'ca-se Vin the Patent Gfce. Signed sind seeledithis 17th day 4of September, A.4 D., 1912. I d

" c. C. BiLLINGs,

' [SEAL] i Actingommsmge'rofPatents.' 

